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�d <br /> µ[r <br /> 6ETTLER - RYAN INC. <br /> July 25,2001 <br /> G-R Job#180138 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road,Suite 120 <br /> Roseville,California 95661 <br /> RE: Second Quarter Event of June 26 and 27,2001 <br /> Groundwater Monitoring&Sampling Report <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton,California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure <br /> - Groundwater Sampling (attached) <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons <br /> Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are <br /> summarized in Table 1 A Potentiometric Map is included as Figure 1 <br /> • Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating Procedure <br /> -Groundwater Sampling(attached) The field data sheets are also attached The samples were analyzed by Sequoia <br /> Analytical Analytical results are summarized in Tables 1, 2 and 3 A Concentration Map is included as Figure 2 <br /> The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> 2�pFESSlpr, <br /> Deanna L Harding ���Op Ke F! <br /> Project Coordinatorco <br /> � i w No C 55734 n <br /> * Exp t - -� <br /> Hagop Kevork ��l CIWI <br /> P E No C55734 OF 0 PA, <br /> Figure 3 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 6981 yml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925) 551 - 7555 <br />